It's by far and away my favorite pack, and I especially adore the new compatibility system, milestones, plus varied likes and dislikes. Family dynamics also make a big difference in my gameplay, and I'm really loving the infants.
The reason I only gave it an 8 is that the world is my least favorite thus far. It's far too barren, doesn't have any unique housing that I usually associate with San Francisco, and is just plain boring and a waste of hard drive space. I would much rather they would have not added a world, and instead expanded on something else like elders, or even adding more buildable lots to existing worlds. If the world was better, it would have been a 10/10 pack for me.